Laser Surface Melting of 17-4 PH Precipitation-Hardenable Stainless Steel

UM > Faculty of Science and Technology > DEPARTMENT OF ELECTROMECHANICAL ENGINEERING

Status	已發表Published
	Laser Surface Melting of 17-4 PH Precipitation-Hardenable Stainless Steel
	Cheng, Z.C.; Kwok, C.T.; Lo, K.H.
	2010-03-01
Source Publication	Proceedings of Pacific International Conference on Application of Lasers and Optics 2010
Publication Place	USA
Publisher	Laser Institute of America
Abstract	Preciptation-hardenable (PH) stainless steels are widely employed in industry for their high mechanical strength, reasonable toughness and moderate corrosion resistance. In the present study, laser surface melting of 17-4 PH precipitation-hardenable stainless steel (Fe-17%Cr-4%Ni-4%Cu-0.3%Nb) was attempted using a 2.5-kW continuous wave Nd:YAG laser for enhancing its corrosion resistance and hardness. The pitting corrosion behavior of laser surface-melted samples processed under different processing conditions in 3.5% NaCl solution at 25 °C was studied by open circuit potential measurement and potentiodynamic polarization technique. Compared with the annealed and aged 17-4 PH, the corrosion resistance of the laser surface-melted samples was significantly improved, as evidenced by a noble shift in open circuit potential, a higher pitting potential, a wider passive range and a lower passive current density. The enhanced corrosion resistance was attributed to the refinement of precipitation of copper particles in the ferrite matrix. In addition, the hardness of the laser surface-melted 17-4 PH was found to be higher than that of the aged and annealed ones by 14% and 27% respectively.
Keyword	Laser surface melting Nd:YAG laser preciptation-hardenable stainless steel pitting corrosion hardness
Language	英語English
The Source to Article	PB_Publication
PUB ID	5164
Document Type	Conference paper
Collection	DEPARTMENT OF ELECTROMECHANICAL ENGINEERING
Corresponding Author	Kwok, C.T.
Recommended Citation GB/T 7714	Cheng, Z.C.,Kwok, C.T.,Lo, K.H.. Laser Surface Melting of 17-4 PH Precipitation-Hardenable Stainless Steel[C], USA:Laser Institute of America, 2010.
APA	Cheng, Z.C.., Kwok, C.T.., & Lo, K.H. (2010). Laser Surface Melting of 17-4 PH Precipitation-Hardenable Stainless Steel. Proceedings of Pacific International Conference on Application of Lasers and Optics 2010.

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